JP6133809B2 - Lead wire support structure for rotating barrel for plating - Google Patents

Description

  The present invention relates to a lead wire supporting structure for a rotating barrel for plating used when plating an object to be plated (work) such as an electronic component of a minute size formed to a size of 0.2 to 1 mm, for example.

Conventionally, a rotating barrel type plating apparatus as shown in FIG. 1 and FIG. In the above-described apparatus, with the workpiece contained in the plating solution, a cathode electrode lead wire is inserted into the support shaft of the barrel in a rotation restricted state in the rotating barrel to support the cathode electrode.
The lead wire support portion that rotates around the lead wire while supporting the lead wire in the barrel together with the barrel and is exposed in the barrel includes a boundary portion between the rotation side of the lead wire support portion and the fixed side of the lead wire, wear, A rotating bush (bush 32) and a fixed bush (collar 12) are connected to the rotating side (boss-like member 311) and the lead to prevent a defect that the work enters or gets caught in a gap that increases due to wear due to contact with the work. The fixed bush and the rotary bush are rotatably fitted to each other between the wire 10 and the fixed bush 12 are configured to be exchangeable.

JP 2005-23361 A

  The above-mentioned lead wire support portion of Patent Document 1 with a fixed bush and a rotating bush is provided with a feature that the processing dimensions of both bushes can be easily managed and can be replaced and replaced when the fixed bush is worn. It is superior to what is not.

  However, the clearance (fitting tolerance) between the fixed bush and the rotating bush must be smaller than the clearance between the support shaft 4 and the boss-like member 311 and as small as possible in order to prevent the workpiece from being caught. There is a drawback that it is easy to apply and wear is severe. In particular, when the fixed bush is worn due to long-term use, there is a disadvantage that a minute work is sandwiched as before, a gap between both bushes further increases due to contact with the work, and a gap at the boundary is reduced. Therefore, there is a problem that the processing management of the fitting tolerance is strict and the exchange frequency is increased.

In the present invention for solving the above-mentioned problems, firstly, a hollow shaft support portion 7 is provided between the end portion of the barrel 1 for accommodating the workpiece and the support frame 4 for supporting the barrel 1. A lead wire 11 that supports the barrel 1 so as to be rotationally driven and is inserted into the hollow portion of the shaft support portion 7 in a rotation-restricted state is passed through the hollow portion of the shaft support portion 7 and rotates together with the barrel 1. In the lead wire support structure in which the fixed bush 21 fixed to the lead wire 11 side is positioned and fitted between the inner periphery of the lead wire support portion 22 exposed inside and the outer periphery of the coating layer 28 of the lead wire 11, The lead wire support portion 22 and the fixed bush 21 come into contact with each other, and a ring-shaped flange portion 21c covering the boundary portion 20 of the end surface exposed in the barrel 1 is provided to protrude from the outer periphery of the fixed bush 21. It is said.

  Secondly, a fixed shaft 14 to which the shaft support portion 7 is attached to the frame 4 side, and is rotatably fitted to the fixed shaft 14, and rotates together with the barrel 1 to support the lead wire in the hollow portion 8 at the end in the barrel 1. The rotating shaft 17 provided with the part 22 is provided.

  Third, the lead wire support portion 22 is fitted into the hollow portion 8 at the end of the rotary shaft 17 in the barrel 1 in a positioned state and is fixedly fitted to the covering layer 28 of the lead wire 11. The fixing bush 21 is provided.

  Fourth, the covering layer (28) is made of a material having elasticity, and the fixed bush (21) is fitted in the outer periphery of the covering layer (28) in an elastic and intimate manner.

Fifth, the lead wire support portion 22 includes a rotary bushing 19 fitted and fixed to the rotary shaft 17 side in the hollow portion 8 at the end of the barrel 1 of the rotary shaft 17, and an inner periphery of the rotary bushing 19. is composed from the fixed bush 21 for mated to relatively rotatable surface side, is characterized in that the material of low friction than the material of fixing the material bush 21 of the rotary shaft sleeve 19.

  Sixth, the engaging bush 21b is provided on the peripheral surface of the fixed bush 21 to position the fixed bush 21 by restricting the axial movement of the lead wire support 22 together with the flange 21c. Yes.

  Seventh, the engaging portion 21b is a protrusion that protrudes to the outer peripheral side of the end portion on the opposite side of the flange portion 21c of the fixed bush 21 and engages with the inner end face of the lead wire support portion 22. .

Eighth, a slit 21a in the axial direction is formed in the peripheral wall on the side of the engaging portion 21b that is the end opposite to the flange portion 21c of the fixed bush 21, and the engagement of the fixed bush 21 is formed. It is characterized in that the outer diameter on the part 21b side can be elastically reduced in the central direction.

The present invention configured as described above has the following effects.
(1) The circular boundary portion of the fitting surface between the inner periphery of the lead wire support that rotates with the barrel and the outer periphery of the fixed bush that is externally fitted to the lead wire and is restricted from rotating together with the lead wire is Since it is covered by the flange part protruding in the outer peripheral direction (radial direction), it is not exposed in the barrel where the workpiece is stirred. For this reason, it is possible to prevent wear and damage at the boundary due to contact of the workpiece, and pinching and entering of the workpiece.

(2) Since the boundary portion is covered with a protruding flange portion having a thickness in the radial direction, even if there is a slight gap or clearance, there is almost no wear due to rotation. Even if it is enlarged, it does not come into contact with the workpiece, and it is easy to manage the inner diameter of the lead wire support part and the processing accuracy of the fixed bush, and there is an advantage that the replacement frequency of the fixed bush is less. In addition, since almost no load is applied between the back surface of the flange portion and the end surface of the lead wire support portion, the life of the fixed bushing is not affected.

(3) By providing a fixed shaft and a rotating shaft fitted to the shaft support, by appropriately selecting the material of the rotating shaft, by directly fitting the fixed bush on the rotating shaft side, the rotating bush By interposing the rotating bush, it is possible to select only the rotating bush material and to replace the rotating bush itself.

(4) In addition to the collar part, the fixed bush is provided with irregularities on its peripheral surface as an engaging part (in this case, irregularities that engage with it may be formed on the inner circumference of the rotating bush), or opposite the collar part Protrusions projecting on the outer periphery can be provided at the end on the side and engaged with the inner end on the inner side of the lead wire support as shown in the embodiment. With this structure, the processing accuracy of the positioning portion can be moderated. Further, by providing a slit having an open end on the peripheral wall on the opposite side to the flange of the fixed bush, the assembly of the fixed bush can be facilitated and exchanged.

It is a whole front view which shows the support structure of the rotation barrel to which this invention is applied. (A), (B) is an expanded sectional view which shows the principal part of the axial support part of the rotation input side of a barrel, and the other support side, respectively. It is an expanded sectional view which shows the structure and assembly state of the rotating bush and fixed bush in a shaft support part. It is an expanded sectional view showing the structure of a lead wire.

  The drawings show one embodiment of the present invention, and FIG. 1 is a front view showing the overall structure of the barrel 1. In this example, a mesh-like mesh-like peripheral wall 2 and an end plate 3 that do not pass a workpiece are provided, and a longitudinal frame 4 connected in parallel on the left and right has a predetermined inclination angle and is freely rotatable. It is supported. Reference numeral 6 denotes a connecting rod for the frame 4, and the barrel 1 is pivotally supported on the left and right frames 4 via a pivotal support 7.

  Each shaft support 7 supports a hollow portion 8 (see FIG. 2) by inserting a lead wire 11 of a cathode electrode 9 as shown in FIG. It is supported so as to face from the left and right near the center of the section. A rotation driving gear 12 is attached to the rotation input side shaft support portion 7 and is rotationally input via a relay gear 13 supported by the input side frame. The relay gear 13 receives rotational input from a prime mover such as a motor (not shown).

  2A shows the shaft support 7 on the rotation input side of the barrel 1, and FIG. 2B shows the mechanism of the shaft support 7 on the other side. The fixed shaft 14 described below mounts the gear 12 as a shaft. The left and right mechanisms are the same except that the lengths of the parts to be performed are different.

  The shaft support portion 7 is attached with a bolt 16 by inserting a sleeve-like fixed shaft 14 from the outside of the frame 4, and a housing-like rotation shaft 17 that rotates integrally with the barrel 1 is rotatable at an inward tip thereof. It is mated. An inclined collar 18 whose inner end surface is inclined with respect to the shaft center is fitted to the outer periphery of the outer end portion of the rotating shaft 17 so as to correspond to the inclination angle of the barrel 1, and the end of the barrel 1 along the inner end surface. The plate 3 is attached, and a barrel rotating drive gear 12 is fixed to the barrel 1 side and attached around the fixed shaft 14 on the outer end surface of the inclined collar 18.

  The rotating shaft 17, the inclined collar 18, and the gear 12 rotate together with the barrel 1 with respect to the fixed shaft 14, and the barrel 1 is inclined with respect to the rotating axis as shown in FIG. The ends are alternately rotated eccentrically in the opposite direction, and the workpiece housed inside is subjected to rotation and swinging by the lifting operation on the left and right sides. Uniform plating is performed by stirring in the plating solution below L.

  The lead wire 11 is inserted into the hollow portion 8 of the shaft support portion 7 from the outside of the frame 4 toward the inside of the barrel 1 as described above, but the tip end (barrel side end portion) of the rotating shaft 17 is the barrel 1. A rotary bush 19 fitted and fixed on the rotary shaft 17 side is fitted and fixed to the outer periphery of the lead wire 11 between the inner peripheral surface inside the tip and the outer periphery of the lead wire 11. The fixed bush 21 is fitted so as to be relatively rotatable. In this example, the rotating shaft 17 and the rotating bush 19 that rotate integrally with each other constitute a lead wire support portion 22, and the lead wire 11 is supported via a fixed bush 21 that is fixedly fitted to the outer periphery thereof. The inner part of this is facing downwardly in the barrel 1 while supporting the electrode 9 at the tip. The clearance (tolerance) between the rotating bush 19 and the fixed bush 21 is preferably larger than that between the fixed shaft 14 and the rotating shaft 17.

  FIG. 3 is a cross-sectional view showing the structure and assembly structure of the rotary bush 19 and the fixed bush 21 itself. Of these, the rotary bush 19 has low friction and wear resistance, such as polyacetal (POM), and has a low friction coefficient. The fixing bush 21 is made of a general-purpose resin such as polypropylene, which is made of a resin having self-lubricating properties. For this reason, as will be described later, the fixing bush 21 that is elastically closely fitted to the insulating coating layer 28 of the elastic lead wire 11 has high fixability to the lead wire 11 and a space between the fitting surfaces thereof. There is no clearance and the workpiece is not caught. At the same time, since the rotary bush 19 is a low friction material in relation to the rotary bush 19, smooth rotation is ensured. Since the fixed bush 19 is a wear-resistant material, the replacement due to wear is generally only the fixed bush 21.

  When the rotary bushing 19 is fitted in the rotary shaft 17 as shown in FIG. 2, the engaging portions 23 formed by ring-shaped irregularities formed on the fitting surfaces of the rotary bushes 19 are engaged with each other in the axial direction. Positioning is fixed. A plurality of (four in the illustrated example) slits 19a having open ends are formed on the end peripheral wall on the rotating shaft side of the rotary bush 19, and the peripheral wall of this portion is elastically pressed inward. Thus, the diameter is reduced, and the engagement portion 23 is engaged to be in a fitted state.

  On the other hand, a plurality of similar slits 21a (two in the illustrated example) 21a are formed in the fixed bush 21. At the time of insertion fitting, a ring-shaped projection 21b formed to protrude from the outer periphery of the insertion end is elastic from the outer periphery. The outer diameter is reduced by pressing (see the arrow in FIG. 3) and inserted into the rotating bush 19. At this time, when the fixing ring 21 is inserted to the deepest part, the protrusion 21 a is removed from the inner periphery of the rotating bush 19, and the end diameter of the bush is restored, and the protrusion 21 b is engaged with the inner end surface of the rotating bush 19. . The protrusions 21b do not necessarily have to be ring-shaped protrusions, and may have a structure in which concavities and convexities are formed on the mating surfaces of the protrusions 21b and engage with each other at the time of fitting as in the case of the rotating shaft 17 and the rotating bush 19. .

  Further, a flange 21c projecting in a ring shape in the outer peripheral direction protrudes from the end portion on the barrel 1 side of the fixed bush 21, and engages with both ends of the rotary bush 19 together with the projection 21b to position the rotary bush 19 It becomes. At this time, a slight clearance (for example, about 0.15 mm) is provided between the protrusion 21b and the flange portion 21c with respect to the entire length of the rotating bush 19, thereby facilitating the engagement at the time of fitting and allowing for processing errors. Increasing degree.

  And since the said collar part 21c protrudes from the outer periphery of the fixed bush 21, it becomes a structure which covers the fitting boundary part 20 of the fixed bush 21 exposed in the barrel 1 and the rotation bush 19. FIG. As a result, the workpiece agitated inside the barrel 1 does not come into contact with the boundary portion 20 of the fitting surface, and the gap 20 due to damage or wear of the fitting surface boundary 20 due to the contact is expanded. This prevents the workpiece from being caught in the gap. The flange portion 21c only needs to be close to or in contact with the barrel-side end portion of the rotary bushing 19, and therefore does not need to be installed strictly at the barrel-side end portion of the fixed bushing 21. Moreover, the outer peripheral cross section of the collar part 21c forms the inclined surface toward the axial center side so that a workpiece | work may not get on the outer periphery.

  FIG. 4 is an enlarged cross-sectional view showing an example of the structure of the cathode electrode 9 and the lead wire 11. A metal wire 26 for connecting a terminal to a power source is provided on the base end side of the core wire 24 which is a conductive material at the center. The electrode 9 is screwed and fixed to the front end side via a soldered bolt 27.

  An insulating coating layer 28 having a certain elasticity and flexibility made of urethane resin, silicon resin, or the like is attached to the outer periphery between the electrode 9 and the terminal fitting 26, and the tip of the coating layer 28 A sealing tube 29 made of heat-shrinkable resin is attached to the peripheral surface of the base end portion of the electrode 9 in order to prevent the plating solution from entering the coating layer 28.

  Since the fixed bush 21 is fitted to the outer periphery of the coating layer 28 having elasticity, the lead wire 11 is always maintained even when the rotary bush 21 rotates due to the friction force at the time of fitting and the low friction of the rotary bush 19. It is fixed to the side.

1 Barrel 4 Frame 7 Shaft Support 8 Hollow Part 9 Electrode 11 Lead Wire 12, 13 Gear 14 Fixed Shaft 17 Rotating Shaft 19 Rotating Bush (Lead Wire Supporting Section)
20 Boundary part 21 Fixed bush 21a Slit 21b Protrusion (engagement part)
21c collar part 22 lead wire support part 23 engagement part 24 core wire 28 coating layer

Claims (8)

  A hollow shaft support (7) is provided between the end of the barrel (1) for accommodating the workpiece and the support frame (4) for supporting the barrel (1) so that the barrel (1) can be driven to rotate. Then, the lead wire (11) energized to the electrode (9) in the barrel (1) is inserted into the hollow portion of the shaft support portion (7) in a rotation-restricted state and rotated together with the barrel (1) to rotate the shaft support portion (7). The fixed bush fixed to the lead wire (11) side between the inner periphery of the lead wire support portion (22) exposed to the inside of the barrel (1) of the lead wire and the outer periphery of the coating layer (28) of the lead wire (11) In the lead wire support structure in which (21) is positioned and fitted, the boundary portion (20) of the end face exposed in the barrel (1) when the lead wire support portion (22) and the fixed bush (21) come into contact with each other. A ring-shaped flange (21c) covering the outer periphery of the fixed bush (21) Lead support structure of the rotary barrel plating provided by.   The shaft support (7) is attached to the frame (4) side, and the fixed shaft (14) is rotatably fitted to the fixed shaft (14), rotates together with the barrel (1), and ends in the barrel (1). The lead wire support structure of the rotating barrel for plating according to claim 1, further comprising a rotating shaft (17) provided with a lead wire support portion (22) in the hollow portion (8).   The lead wire support portion (22) is fitted in a positioned state in the hollow portion (8) at the end of the barrel (1) of the rotating shaft (17) and the covering layer (28) of the lead wire (11). The lead wire support structure of the rotating barrel for plating according to claim 2, further comprising a fixing bush (21) fixedly fitted to the plating barrel.   The lead of the rotating barrel for plating according to claim 3, wherein the coating layer (28) is made of a material having elasticity, and the fixed bush (21) is fitted in the outer periphery of the coating layer (28) in an elastic and intimate contact. Line support structure. The lead wire support portion (22) includes a rotary bush (19) fitted and fixed to the rotary shaft (17) side in the hollow portion (8) at the end in the barrel (1) of the rotary shaft (17). And the fixed bush ( 21 ) fitted so as to be relatively rotatable on the inner peripheral surface side of the rotary bush (19), and the material of the rotary bush (19) is lower than the material of the fixed bush (21). The lead wire support structure of the rotating barrel for plating according to claim 3 or 4, wherein the material is a friction material.   An engaging portion (21b) is provided on the circumferential surface of the fixed bush (21) to position the fixed bush (21) by restricting axial movement of the lead wire support portion (22) together with the flange portion (21c). The lead wire support structure of the rotating barrel for plating according to any one of claims 1 to 5.   The engaging portion (21b) is a protrusion that protrudes to the outer peripheral side of the end portion on the opposite side of the flange portion (21c) of the fixed bush (21) and engages with the inner end surface of the lead wire support portion (22). Item 7. A lead wire support structure for a rotating barrel for plating according to item 6. A slit (21a) in the axial direction is formed in the peripheral wall on the side of the engaging portion (21b), which is the end opposite to the flange portion (21c) of the fixed bush (21). The lead wire support structure of the rotating barrel for plating according to claim 6 or 7, wherein the outer diameter of the engaging portion (21b) side of (21) is configured to be elastically reduced in the center direction.

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